12111221204 has 6 divisors (see below), whose sum is σ = 21194637114. Its totient is φ = 6055610600.

The previous prime is 12111221191. The next prime is 12111221219. The reversal of 12111221204 is 40212211121.

It can be written as a sum of positive squares in only one way, i.e., 11867923600 + 243297604 = 108940^2 + 15598^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1513902647 + ... + 1513902654.

It is an arithmetic number, because the mean of its divisors is an integer number (3532439519).

Almost surely, 2^12111221204 is an apocalyptic number.

It is an amenable number.

12111221204 is a deficient number, since it is larger than the sum of its proper divisors (9083415910).

12111221204 is a wasteful number, since it uses less digits than its factorization.

12111221204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027805305 (or 3027805303 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12111221204 its reverse (40212211121), we get a palindrome (52323432325).

The spelling of 12111221204 in words is "twelve billion, one hundred eleven million, two hundred twenty-one thousand, two hundred four".